Spool for electrical instruments and the like



March 5, 1929. SIMPSON 1,704,151

SPOOL FOR ELECTRICAL INSTRUMENTS AND THE LIKE Filed July 18,, 1927 [ill][Mum 502m?? fqzy 5077/ Mum,

Patented Mar. 5, 1929.

UNITED STATES.

RAY SIMPSON, OF RIVER FOREST, TLLINOIS, ASSIGNOR TO JEWELL ELECTRICALIN- STRUMENT 60., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PATENT OFFICE.

SPOOL FOR ELECTRICAL INSTRUMENTS AND THE LIKE.

Application filed July 18,

The present invention relates to spools for electrical instruments andthe like and a method of constructing electrical connectors for .suchspools and other small electrical parts.

One of the objects of my invention is the provision of a spool forelectrical instruments having a conducting member molded into andsecured in said spool at a plurality of points in such manner that theconductor may be severed between any of its points of support and bentto form a simple connector.

Another object of my invention is the provision of a novel form ofconstruction for small electrical parts and connectors of the classdescribed, upon which all projecting parts are circular in cross sectionso that dies may be constructed with a minimum of labor 2o upon-a lathe.I

Another object of my invention is the provision of a novel method ofconstructing or forming the spools and connectors of the classdescribed.

Other objects and advantages of my invention will appear more fully fromthe following description and from the accompanyin drawings, inwhichsimilar characters ofre erence indicate similar parts throughout theseveral views.

In the drawings:

Fig. 1 is a lan view of a spool at one of the stages in t e formation ofthe connectors;

Fig. 2 is an elevational cross sectional View on the lines 22 of Fig. 1;

' Fig. 3 isa plan view of the finished spool and connectors; and 4 Fig.4 is a side elevational view of the same.

Referring to Figs. 1 and 2, 10 indicates in its entirety my spool andits associated parts in this stage of its manufacture. The spool 10 ispreferably formed with a rod or shaft 11 supporting at each end a discor flange 12 and 13 projecting at substantially right- 5 angles to theshaft 11.

The shaft 11 and the flanges 12'and 13 are preferabl but notnecessarily, formed with an axial ore 14'for convenience in attachmentof the spool to other parts and for use 59 in winding the spool;however, the spool may also be formed without such a bore.

The spool 10 is-provided at one or both of its ends with a plurality ofprojecting bosses 15, 16, 17 and 18, and the bosses 15 to 18 arepreferably made of substantially circular 1927. Serial No. 206,434.

cross section in order to facilitate the manufacture of dies. The diesmay thus be made upon a lathe with a minimum of labor and machining. Thebosses are also preferably slightly tapered to facilitate the moldingoperation.

In order to provide a simple, efficient and inexpensive connector forspools of the class described, I prefer to mold the spool 10 of bakeliteor other insulating compound and during this molding operation there maybe imbedded in the bosses 15 to 18 an electrical conductor 19.

The conductor 19 is preferably located within the bosses upon theexterior surface of the flange 13 but, if desired, it may be spacedslightly from said surface without dispensing with many of theadvantages of the invention. The conductor 19 is preferably a strip ofthin sheet metal of electrical conducting qualities, such as copper, andit is preferably in the form of an annular ring, as shown in Fig. 1.

The flange 13 may also be formed with a plurality of small apertures 20located near its outer edge for the passage of the electrical conductorswhich form the coils 21. The flange 13 may also be provided with similarapertures 22 near the shaft 11 to permit the passage of the inner end ofone or more conductors forming the coils 21.

After the spool has'been molded as shown in Figs. 1 and 2, with theconductor 19 imbedded at a plurality of points, such as the bosses 15 to18, this spool ma be employed for supporting any number 0 separate coilsfor electrical instruments or other purposes. A number of separateconnectors ma' then be formed, dependin upon the num er of coilsemployed upon the spool, and the method of forming these connectors isas follows: A saw or other cutting instrument capable of severing theconductor 19 may be used and the conductor 19 cut at a plurality ofpoints such as 23, 24, 25 and 26. This efl'ectively separates theconductor 19 into a plurality of short segments, each of which issupported by one or more bosses in which the segment is imbedded, and Idesire to be understood that an number of such bosses'and cuts may beemp oyed.

The loose ends 27, 28, 29 and 30 of the segment-s may then be bent uward and back' upon themselves, as shown mFigs. 3 and 4, to form aplurality of connectors 31, to which 110 terminals may be soldered orotherwise permanently connected. The spool 10 may then be wound with aplurality 01: turns of insulated wire or spaced turns of wire separatedby insulating layers, thereby forming the coils 21. The endsof the coilsmay be brought up through the apertures 20 or 22 and soldered orotherwise permanently connected to any of the segments of the conductor19."

As shown in Fig. 3, both the terminal wires 32 and the ends 33 of thecoils have been inserted Within a single connector 31 and secured bysoldering.

Another method of accomplishing the same result is to solder the end 33of the coil to the segment at another point, reserving the connector 31for the terminal 32.

If desired, the cuts 24 may be made midway between a pair of bosses sothat two loose ends or segments will 'be available on each side of theboss. One of these ends may be used as a connector for the end 33 of acoil, while the other end of the segment may be used as a connector fora terminal 32.

It will thus be observed that l have provided a simple and economicalstructure by which any number of connectors may be formed upon a spooloi uniform type and that my spool is adapted to be molded of bakeliteorother insulating compound with the connectors secured therein at aplurality of points. The dies for moldingsuch parts may be constructedwith a minimum of labor because all of the parts are circular in crosssection and the spool and connector thereby provided are durable,economical and eliicient.

While l have described my novel connector and its form of support asapplied to an insulating spool for electrical'instruments, ll desire tobe understood that my invention is not necessarily confined to use uponspools but may be employed uponsmall electrical parts of all kinds,wherever it is desired to use connectors of the type described, such asupon transformer casings or casings for other small electrical parts.

While I have illustrated and described a preferred embodiment of myinvention, many modificationamay be made without departing from thespirit of the invention, and I do not wish to be limited tothe precisedetails set forth but desire to avail myself of all changes within thescope of the appended claims.

Having thus describedmy invention, what I claim as new and desire tosecure by Letters Patent of the United States is:

1. In an electrical instrument, a spool for coils or the like,comprising a molded insulating member having a plurality of cylindricalbosses molded thereon and a conductor supported on said spool by moldingthe same in one or more of said bosses.

2. In an electrical apparatus, a molded insulating member having ends ofcircular cross section and having a boss of circular cross sectionmolded on said member, and a strip of electrical conducting materialmolded in said boss'and exposed at other points on said memher to forman electrical connector.

3. ln an electrical apparatus, a molded insulating member having ends ofcircular cross section and having a plurality of bosses of circularcross section inolded on said member, and a ring of electricalconducting material molded in said bosses on the surface of said member,

The method of forming an electrical connector, comprising molding aninsulating support with a strip of electrical conducting material moldedtherein at a plurality of points and exposed at other points andsevering the stripbetween one or more points of support.

5. Themethod of forming an electrical connector, comprising molding aninsulating support with a strip of electrical conducting material moldedtherein at a plurality of points and exposed at other points, severingthe strip between one or more points of support and bending said stripto form an electrical connector 6. ln a new article of manufacture,acoil unit for electrical instruments and the like comprising a moldedinsulating spool having a plurality of integral frustro-conical bossescarried by one end, anda ring of electrical conducting material lying onone end of said spool and secured by molding in said bosses, said ringbeing severed between certain of said bosses, and bent to formelectrical connectors. l

7. In anew article of manufacture, a coil unit for electricalinstrumentsand the like comprising a molded insulating spool having a plurality ofintegral frustro conical bosses carried by one end, a ring of electricalconducting material lXlIlg on one end of said spool and secured bymolding in said bosses, said ring being severed between certain of saidbosses, and bent to form electrical con- RAY SIMPSON.

